Cisco UBR7246VXR Manuale di installazione - Pagina 25
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Clock Source Paths
The schematics in this appendix display the various clock source paths established by the Cisco Cable
Clock Card in a Cisco uBR7246 VXR depending on your external connection(s) and configuration.
Figure A-1
PA
PRI
SRC
PA
SEC
SRC
Cisco Cable Clock Card Hardware Installation Guide for the Cisco uBR7246VXR Universal Broadband Router
OL-26705-01
Primary External Clock Source
Port adapters w/
internal clocking
PA
PA
Midplane
clk mux
Clock card primary source to midplane 8 kHz
A P P E N D I X
External SRCs
PRI SEC
Clock card
clk mux
PRI clk
PRI LOS
SEC clk
SEC LOS
No cable clock
source-midplane
A
Clock recovery
and filter chips
20.48
To line
cards
Cable clock
force primary
(default)
A-1
MHz